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    • Numerical Simulation of AC Discharge Plasma Assisted Ethylene/Air Combustion
    DOI：10.13949/j.cnki.nrjgc.2022.01.007
    Key Words:non-equilibrium plasma-assisted ignition/combustion  AC discharge  ethylene  numerical simulation
    Author NameAffiliationE-mail
    BAN Yangyang* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China banyang@tju.edu.cn 
    ZHANG Fan* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China fanzhang_lund@tju.edu.cn 
    ZHONG Shenghui State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    ZHU Jiajian Science and Technology on Scramjet Laboratory， National University of Defense Technology， Changsha 410073， China  
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    Abstract:The plasma assisted combustion model was established by coupling zero-dimensional plasma kinetic solver and combustion kinetic solver to study the effect of non-equilibrium plasma by AC discharge on the combustion process of C2H4/air mixture and compared with auto-ignition process. In this model， the electron energy distribution function was solved for electron collision reaction rates and the temporal evolution of temperature， species concentration， heat release rates and production/consumption rates of the key species were obtained during continuous discharge under lean-burn condition. The results show that under the condition of plasma assisted combustion， new reaction pathways， more radicals and excited components are produced， and the ignition delay time is shortened by nearly two orders of magnitude. With plasma， the quenching and relaxation of the excited oxygen and nitrogen molecules lead to the conversion from electric energy， chemical energy to heat energy. Thus， the total heat release after discharging increases and the maximal combustion temperature is around 400 K higher. In addition， the collisions between electron and O2， the de-excitation reaction of N2 excited states and the singlet oxygen O（1D） promote the formation of oxygen atom. Also， the formation of H atom increases O atom mainly through reaction H+O2OH+O， accelerating the oxidation of C2H4 to HCO and CO as well as the shorter ignition delay time and the higher combustion efficiency.
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